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Diane Nash, portrayed by Tessa Thompson in Ava DuVernay's "Selma," was a prominent civil rights activist and a key figure in the Student Nonviolent Coordinating Committee (SNCC). Known for her strategic planning and commitment to nonviolent protest, Nash played a crucial role in organizing the Selma to Montgomery marches, a pivotal moment in the fight for voting rights and racial equality during the Civil Rights Movement.